title: The relationship of blood lymphocytes to the recirculating lymphocyte pool.
abstract: Lymphocyte recirculation facilitates the detection and elimination of pathogens and the dissemination of immunologic memory. It is generally assumed that all small lymphocytes in the blood are actively recirculating, yet there is little quantitative data directly comparing the migration of this population with actively recirculating, lymph-derived lymphocytes. In this study blood lymphocytes were labeled with fluorescein isothiocyanate (FITC), and lymph lymphocytes were labeled with CM-DiI, reinfused intravenously, and monitored in blood and lymph. After equilibration the concentration of blood lymphocytes was several times higher in blood than in lymph, whereas lymph lymphocytes displayed the opposite behavior. This suggested that blood lymphocytes did not recirculate as efficiently as lymph lymphocytes, so we examined the following blood lymphocyte subsets in greater detail: B cells, CD4+, CD8+, and gammadelta T cells. Within 4 hours postinjection the percentage of FITC+ CD8+ and CD4+ lymphocytes fell in the blood and remained significantly lower than the injected sample. In contrast, the concentration of FITC+ gammadelta T cells did not change, and the percentage of FITC+ B cells increased. These data suggest that subpopulations of B and perhaps gammadelta T lymphocytes in the blood do not recirculate efficiently through lymph nodes.
authors.affiliation: Department of Pathology, University of Toronto, Toronto, North York, Ontario, Canada.
authors.forename: W N
authors.initials: WN
authors.lastname: Andrade
authors.forename: M G
authors.initials: MG
authors.lastname: Johnston
authors.forename: J B
authors.initials: JB
authors.lastname: Hay
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology; D015704:CD4 Antigens / Q000032:analysis; D018956:CD5 Antigens / Q000032:analysis; D002232:Carbocyanines; D002470:Cell Survival; D005260:Female; D016650:Fluorescein-5-isothiocyanate; D005456:Fluorescent Dyes; D016130:Immunophenotyping; D007700:Kinetics; D008196:Lymph / Q000166:cytology; D018655:Lymphocyte Count; D008214:Lymphocytes / Q000166:cytology* / Q000276:immunology*; D012756:Sheep; D013601:T-Lymphocytes / Q000166:cytology
chemical_list: D015704:CD4 Antigens; D018956:CD5 Antigens; C101089:CM-DiI; D002232:Carbocyanines; D005456:Fluorescent Dyes; D016650:Fluorescein-5-isothiocyanate